Potential answers for "Supplementary material in backs of books"

⭐⭐⭐⭐ ADDENDA
⭐⭐⭐ APPENDIX
⭐⭐⭐ APPEND
⭐⭐⭐ SPINES
⭐⭐ ADDL
⭐⭐ AUX
⭐⭐ ACCESSORY

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